and many more benefits!

GMAT Club Timer Informer

Hi GMATClubber!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Events & Promotions

Christina scored 760 by having clear (ability) milestones and a trackable plan to achieve the same. Attend this webinar to learn how to build trackable milestones that leverage your strengths to help you get to your target GMAT score.

Right now, their GMAT prep, GRE prep, and MBA admissions consulting services are up to $1,100 off. GMAT (Save up to $261): SPRINGEXTRAGMAT GRE Prep (Save up to $149): SPRINGEXTRAGRE MBA (Save up to $1,240): SPRINGEXTRAMBA

Hide Tags

An airline has two daily one-way flights operating from Istanbul
[#permalink]

Show Tags

27 Feb 2019, 03:20

1

00:00

A

B

C

D

E

Difficulty:

95% (hard)

Question Stats:

13%(01:48) correct 87%(02:32) wrong based on 52 sessions

HideShow timer Statistics

An airline has two daily one-way flights operating from Istanbul to Vienna. Each flight takes the same path, and hence covers the same distance D every time. The 1st flight travels at a speed between 600 mph and 800 mph and covers D in 2.5 hours. The 2nd flight travels at a speed between 800 and 1000 mph and covers D in 1.75 hours. Which of the following could be possible value(s) of D?

Now, let us look at the problem at hand. The speed of the first flight is given to be in between 600 mph and 800 mph. This flight takes 2.5 hours i.e. (5/2) hours to cover the distance D. Hence, we can say D = Speed x (5/2).If the speed is 600mph, then D could be 1500 miles and if the speed is 800 mph, then D could be 2000 miles. But, since the boundary values cannot be included, we can rule out statement I. Hence, options A, D and E can be eliminated.

The speed of the second flight is given to be in between 800 mph to 1000 mph. This flight takes 1.75 hours i.e. (7/4) hours to cover the distance D. Hence, D = Speed x (7/4).If the speed is 800 mph, then D could be 1400 miles and if the speed is 1000 mph, then D could be 1750 miles. Again, since the boundary values cannot be included, we can rule out statement III. Hence, options C can be eliminated.

Option B is left, which HAS to be the answer because it falls between the boundary conditions in both cases.

There we go, the correct answer option is B.

In a ‘could be’ question, the idea is always to make a statement true, once, so that it can qualify as an answer. At the same time, statement which are DEFINITELY false need to be identified as well so that they can be eliminated as we did with Statements I and II.

The trap in this question - We do not have information about whether the boundary values can be included or not. So, the trap laid here is to play on your inability to decide whether ‘Between’ should include the boundary conditions or not.

By default, when you see the word ‘Between’, the boundary values are to be excluded, unless stated otherwise.

In an official question of a similar nature, the question will specify explicitly whether the boundary values have to be included or not.

Re: An airline has two daily one-way flights operating from Istanbul
[#permalink]

Show Tags

01 Mar 2019, 03:04

Solution

Given:In this question, we are given

• An airline has two daily one-way flights operating from Istanbul to Vienna.• Each flight takes the same path, and hence covers the same distance every time D.• The 1st flight travels at a speed between 600 mph and 800 mph and covers D in 2.5 hours.• The 2nd flight travels at a speed between 800 and 1000 mph and covers D in 1.75 hours.

To find:We need to determine

• Among the given option choices, which one can be a possible value of D.

Approach and Working:The 1st flight travels at a speed between 600 mph and 800 mph and covers D in 2.5 hours.

• Therefore, the D must be greater than = 600 x 2.5 = 1500 miles• And, the D must be less than = 800 x 2.5 = 2000 miles• Combining both, we can say D lies between 1500 and 2000.

The 2nd flight travels at a speed between 800 and 1000 mph and covers D in 1.75 hours.